Ampicillin-Methylester ist eine veresterte Beta-Lactam-Verunreinigung, die aus Ampicillin durch methanolvermittelte Umesterung oder durch unbeabsichtigte Esterbildung während Synthese und Lagerung entstehen kann. Als strukturell verwandtes Penam-Derivat enthält es den reaktiven bicyclischen Kern der Beta-Lactam-Chemie, mit der Summenformel C17H21N3O4S und einer Molekülmasse von 363,43 g/mol. Der Nachweis erfolgt in der Verunreinigungscharakterisierung typischerweise mittels LC-MS/MS und hochauflösender LC-MS, häufig ergänzt durch HPLC mit Diodenarray-Detektion. Die Substanz wird als prozess- und abbauassoziierte Spezies überwacht, da die Veresterung Polarität, chromatographisches Verhalten und hydrolytische Instabilität verändert.
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